Welcome to the Bunnings Workshop community @Tash_13. It's great to have you join us and many thanks for your question.
Can I please clarify if it is the basin sink you wish to paint or the vanity? I only ask as the sink appears to be a shade of white and the vanity a cream colour, this could just be the way the colours appear on my screen though.
For the vanity, I would advise using the Dulux renovation range of products for laminate benchtops as they are waterbased and easy to apply, durable and chip resistant and tintable to thousands of colours.